As a symptom of the current global climate emergency, rising temperatures pervade organizational lives. Yet, organization studies have hardly investigated the everyday organizing necessary to cope and adapt, here and now, to life in a world approaching and even surpassing 50 degrees Celsius. This essay seeks to open spaces of collective inquiry to grapple with practices of organizational co-evolution with heat. I apply Barad’s post-humanist notion of diffraction – patterns of interference in entangled agency – through warming organizations, as rising temperatures intra-act with the matter, materials, bodies and discourses that co-constitute them. Diffractive inquiry helps organization studies understand how rising heat alters and amplifies bodily differences across families, communities, firms, societies and ecologies. This post-humanist view forces to rethink theories of organizational resilience, inequality and identity in co-evolution with heat and other ecological phenomena as part of a relational whole.